Inkscape has now pages support. You can create a multiple page document using Inkscape, just like in Corel Draw. Install this extension, restart Inkscape and you're done. Insert new pages, navigate through pages, print all pages in a single PDF.

This Inkscape extension provides table support for Inkscape. This is one of the features that are present in Corel Draw but are not present in Inkscape. So, just install this extension and you will have table support in Inkscape

APTOS is an open source Apt translator project. It consists of several CAM applications, based on the Apt programming language. It is used to create control programs for cnc mills, lathes, water jets, lasers, and other industrial equipment.

ThanCad is a 2dimensional cad, with limited 3d support and raster inclusion capability and emphasis in engineering. It is being written in Python and since it uses the Tkinter library, it is platform independent.

Fandango, formerly and internally know as elcad. It is a python scripted 3d CAD application; the core is programmed on C++, and interface functions are exported to python to be used as building blocks for new commands.